FluorCam叶绿素荧光成像文献 2007 Low-temperature limitation

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1、PolarBiolDOI10.1007/s00300-007-0331-xORIGINALPAPERLow-temperaturelimitationofprimaryphotosyntheticprocessesinAntarcticlichensUmbilicariaantarcticaandXanthoriaelegansMilonBarták·PeterVáczi·JosefHájek·JerzySmyklaReceived:7May2007/Revised:13June2007/Accepted:25June2007©Springer-Verlag2007Abstract

2、TemperatureresponsecurvesofchlorophyllaIntroductionXuorescenceparameterswereusedtoassessminimumsub-zerotemperatureassuringfunctioningofphotosyntheticLichensaresymbioticorganismscapableofsurvivinginphotochemicalprocessesinphotosystemII(PSII)ofextremeenvironments,includingsub-zerotemperatures.An

3、tarcticlichens.UmbilicariaAntarcticaandXanthoriaLichens’hightolerancetofreezingtemperatureisreportedelegansweremeasuredwithinthetemperaturerangefrome.g.forXanthoriacandelariaandRhizoplacamelanophth-¡20to+10°CbyaXuorometricimagingsystem.Foralma(LangeandKappen1972;Kappen1989,1993).potential(FV/F

4、M)andactual(
II)quantumyieldsofphoto-Thosespeciestoleratedgradualorrapidfreezingtochemicalprocessestheminimumtemperaturewasfoundto¡196°C,evenafterbeingstoredupforseveralyears,bebetween¡10and¡20°C.Non-photochemicalquench-almostimmediatelyresumednormalphotosyntheticratesing(NPQ)ofabsorbedexcitat

5、ionenergyincreasedwithwhenwarmedandwetted.After5–7monthsofcoldandtemperaturedropreachingmaximumNPQat¡15°C.continuousdarkness,theyremaingreenwithintactphoto-Imageanalysisrevealedintrathallineheterogeneityofchlo-syntheticpigments.Inspiteofthefactthatoptimumtem-rophyllaXuorescenceparameterswithte

6、mperaturedrop.peratureforlichenphotosynthesisliesabovezeroTemperatureresponseof
IIexhibitedanS-curvewithpro-temperature(Uchidaetal.2006),itiswellestablishedthatnouncedintrathallinediVerencesinX.elegans.Thesamethemajorityofpoikilohydricautotrophsabundantinalpinerelationwaslinearwithonlylimitedi

7、ntrathallinediVerenceandpolarenvironmentsphotosynthesizeattemperaturesinU.antarctica.TheresultsshowedthatAntarcticlichenbelow0°C(ReiterandTurk2000;Kappen2000).How-specieswerewelladaptedtosub-zerotemperaturesandever,itisstillunderdebater